Sec 1 Express Rain Gauge

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  • The worksheet Water Cycle accompanies this slide.
  • Photo credit (all): ©2008 JupiterImages Corporation
  • Worksheets: The worksheet Clouds accompanies this slide. Photo credit (all): ©2008 JupiterImages Corporation
  • Sec 1 Express Rain Gauge

    1. 1. Rainfall
    2. 4. Cloud formation How are clouds classified? Clouds form when moist air rises and condenses into water or ice crystals. This takes between a few minutes and an hour. Clouds are classified using three criteria: <ul><li>if they bring precipitation . </li></ul><ul><li>shape </li></ul><ul><li>altitude </li></ul>
    3. 5. Cloud types Clouds are named according to their height, shape and whether they bring precipitation. nimbus stratus Heaped fluffy cloud Brings rain Mid-level cloud Layered cloud Cumulo Alto
    4. 6. Rainfall Rainfall is measured using a rain gauge . Rain is a type of precipitation . Precipitation occurs when water vapour in the air cools and condenses into water droplets. Snow, sleet, hail, dew and fog are also types of precipitation. Rainfall is usually measured in millimetres (mm). How is rainfall measured?
    5. 8. Can you recall how to draw and label the different parts of the rain gauge?
    6. 9. Where should the rain gauge be place? <ul><li>In an open area / field </li></ul><ul><ul><li>So that nothing will block the rain from being collected in the rain gauge. </li></ul></ul>
    7. 10. Where should the rain gauge be place? <ul><li>A rain gauge should not be place near trees. </li></ul><ul><ul><li>So that excess water collected from the leaves will not drip into the rain gauge making reading inaccurate . </li></ul></ul><ul><ul><li>OR </li></ul></ul><ul><ul><li>The tree prevent water from being collected in the rain gauge make the reading inaccurate. </li></ul></ul>
    8. 11. Where should the rain gauge be place? <ul><li>A rain gauge should not be place near buildings. </li></ul><ul><ul><li>So that excess water from the rooftop will not drip into the rain gauge making reading inaccurate . </li></ul></ul><ul><ul><li>The building could also radiate heat causing the water collected to evaporate. </li></ul></ul>
    9. 12. Where should the rain gauge be place? <ul><li>It should be partially buried in the ground </li></ul><ul><ul><li>to prevent it from being topple. </li></ul></ul>
    10. 13. Where should the rain gauge be place? <ul><li>It should be placed 30 cm above the ground </li></ul><ul><ul><li>to prevent rain splash entering the rain gauge making the reading inaccurate. </li></ul></ul>
    11. 14. High tech weather instruments
    12. 16. Isohyets <ul><li>a line on a map connecting places having equal rainfall </li></ul>
    13. 19. Climograph <ul><li>It is a graph that shows the monthly precipitation and temperature conditions for a selected place. </li></ul><ul><li>Precipitation is shown by the bar graph. </li></ul><ul><li>A line graph shows temperature. </li></ul>
    14. 20. <ul><li>What is the rainfall for the month of July? </li></ul><ul><li>Which month experiences the highest temperature? </li></ul><ul><li>What is the temperature range for the whole year? </li></ul><ul><li>What is the average precipitation from May to July? </li></ul>

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